Dog Weight Loss Calculator Calories, Goal Date & a Week-by-Week Plan
Turn “my dog needs to lose weight” into a plan you can follow. You’ll get safe daily calories based on your dog’s ideal weight, a realistic goal date, food portions, a treat budget, and a weekly schedule with weigh-in checkpoints. Log weigh-ins and it tells you exactly when to adjust.
By Manzoor Ahmad · Updated October 19, 2026
1 · Your dog
2 · Goal weight
Not sure? Score your dog with three quick body checks in the dog ideal weight calculator.
3 · Your plan
Estimated goal date
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Projected weight
Weigh-in tracker
Weigh every 2 weeks and add the result. The plan checks your dog’s actual weekly rate and adjusts calories by 10% when needed. Entries are saved in this browser only.
Add your first weigh-in after two weeks to see how you’re tracking.
Week-by-week schedule
| Week | Date | Target weight | Lost so far | Progress | Weigh-in |
|---|
At the finish line: keep it off
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How fast should a dog lose weight?
A safe rate is 1–2% of body weight per week (Cornell University College of Veterinary Medicine), which is about 0.7–1.4 lb a week for a 70 lb dog. Start by feeding about 1.0 × the resting energy requirement (RER) of the dog’s ideal weight, where RER = 70 × (ideal weight in kg)0.75. Then weigh every two weeks and adjust calories by about 10%. Most overweight dogs take 3–6 months to reach their goal. In a clinical study, dogs actually lost an average of 0.85% a week.
Key facts at a glance
- Calories: start at 1.0 × RER of the ideal weight, as AAHA bases weight-loss calculations on ideal weight.
- Pace: 1–2% of body weight per week. Faster loss risks muscle loss and constant hunger.
- Check-ins: weigh at least every two weeks. Cut about 10% if loss stalls and add about 10% if it’s too fast.
- Treats: no more than 10% of daily calories, counted inside the total.
- Afterwards: needs stay low. Post-loss maintenance was only about 10% above weight-loss intake, and 48% of dogs regained weight in follow-up (German et al.).
How to use the dog weight loss calculator
- Enter your dog’s weight and choose a goal. Pick its body condition score (6–9) and the calculator estimates the ideal weight at 10% per point, or type a target from your vet.
- Choose a pace. Steady (1.5%/week) suits most dogs. Choose Gentle for seniors, dogs with arthritis or other conditions, and Brisk only with vet supervision.
- Add your food’s calories from the bag or can, so cups and grams are exact. Turn on the treat budget if you use treats for training.
- Follow the schedule and log weigh-ins every two weeks. The tracker compares your dog’s real rate with the 1–2% safe zone and tells you whether to keep going, cut 10% or add 10%.
How many calories should a dog eat to lose weight?
Starting calories = 1.0 × RER of the target weight. Portions assume a 350 kcal/cup food with 10% of calories kept for treats. Many weight-management foods are lower in calories per cup, so use your own label in the calculator.
| Target (ideal) weight | Weight-loss calories/day | Cups/day (350 kcal/cup) | Treats (10%) | Typical maintenance after |
|---|---|---|---|---|
| 10 lb (4.5 kg) | 218 kcal | 0.56 cups | 22 kcal | ≈ 239 kcal |
| 15 lb (6.8 kg) | 295 kcal | 0.76 cups | 29 kcal | ≈ 324 kcal |
| 20 lb (9.1 kg) | 366 kcal | 0.94 cups | 37 kcal | ≈ 402 kcal |
| 25 lb (11.3 kg) | 433 kcal | 1.11 cups | 43 kcal | ≈ 476 kcal |
| 30 lb (13.6 kg) | 496 kcal | 1.28 cups | 50 kcal | ≈ 546 kcal |
| 40 lb (18.1 kg) | 615 kcal | 1.58 cups | 62 kcal | ≈ 677 kcal |
| 50 lb (22.7 kg) | 727 kcal | 1.87 cups | 73 kcal | ≈ 800 kcal |
| 60 lb (27.2 kg) | 834 kcal | 2.14 cups | 83 kcal | ≈ 917 kcal |
| 70 lb (31.8 kg) | 936 kcal | 2.41 cups | 94 kcal | ≈ 1030 kcal |
| 80 lb (36.3 kg) | 1035 kcal | 2.66 cups | 103 kcal | ≈ 1138 kcal |
| 90 lb (40.8 kg) | 1131 kcal | 2.91 cups | 113 kcal | ≈ 1244 kcal |
| 100 lb (45.4 kg) | 1223 kcal | 3.15 cups | 122 kcal | ≈ 1346 kcal |
RER (kcal/day) = 70 × (target weight in kg)^0.75
Ideal weight from body condition ≈ current ÷ (1 + 0.10 × (BCS − 5))
Weeks to goal = ln(target ÷ current) ÷ ln(1 − weekly rate)
How long does it take a dog to lose weight?
Because a dog loses a percentage of its current weight each week, losses shrink slightly as it gets lighter. Here’s how long it takes by how overweight your dog is:
| Overweight by | Typical BCS | At 2% / week | At 1.5% / week | At 1% / week |
|---|---|---|---|---|
| 10% | 6 | 5 weeks (≈ 1.2 months) | 7 weeks (≈ 1.6 months) | 10 weeks (≈ 2.3 months) |
| 20% | 7 | 10 weeks (≈ 2.3 months) | 13 weeks (≈ 3.0 months) | 19 weeks (≈ 4.4 months) |
| 30% | 8 | 13 weeks (≈ 3.0 months) | 18 weeks (≈ 4.1 months) | 27 weeks (≈ 6.2 months) |
| 40% | 9 | 17 weeks (≈ 3.9 months) | 23 weeks (≈ 5.3 months) | 34 weeks (≈ 7.8 months) |
Worked example: a 70 lb dog with a body condition score of 7
- Ideal weight: 70 ÷ 1.2 = 58.3 lb (26.5 kg), so the goal is to lose 11.7 lb.
- Calories: 70 × 26.50.75 ≈ 817 kcal/day. With 10% for treats, that’s 735 kcal of food ≈ 2.1 cups of a 350 kcal/cup food.
- Timeline at 1.5% a week: about 13 weeks. Week 1 target ≈ 69.0 lb (−1.05 lb).
- Check-ins: weigh at weeks 2, 4, 6 and so on. If a fortnight shows less than 1% a week, cut to about 735 kcal.
These are the calculator’s default values.
Low-calorie treat swaps for dogs on a diet
Treats count toward the daily total. These swaps keep the reward and cut most of the calories (approximate values based on USDA nutrient data):
| Treat | Portion | Approx. calories | Notes |
|---|---|---|---|
| Baby carrot | 1 (≈ 10 g) | ≈ 4 kcal | Crunchy. Cut lengthways for small dogs. |
| Green beans | ¼ cup, plain | ≈ 8 kcal | Fresh, frozen or no-salt canned. |
| Cucumber | 5 slices | ≈ 5 kcal | Mostly water, ideal for hot days. |
| Apple | 1 thin slice, no seeds or core | ≈ 8 kcal | Remove the seeds and core. |
| Blueberries | 10 berries | ≈ 9 kcal | Good for training rewards. |
| Kibble from the daily ration | A few pieces | Already counted | The easiest swap: set aside part of breakfast for training. |
Never use grapes, raisins, onion, garlic, chocolate or xylitol-sweetened peanut butter as treats. If your dog gets into any of them, check the grape toxicity calculator or the onion and garlic toxicity calculator.
What research says about dog weight loss
Average weekly loss
In 19 obese client-owned dogs on a weight-loss diet, the average rate was 0.85% a week (range 0.35–1.56%), with 18% of body weight lost overall (German et al., J Vet Intern Med 2007). Real life is often slower than the plan, and that’s normal.
Maintenance stays low
After weight loss, maintenance energy was typically only about 10% higher than intake during weight loss (German et al., Br J Nutr 2011). Going back to “normal” portions brings the weight back.
Regain is common
Of 33 dogs that reached their target, 48% regained more than 5% of their weight during follow-up. Dogs kept on a weight-management diet regained less (German et al., Vet J 2012).
Diet, exercise and habits that make it work
Use a weight-loss food
Cutting a regular food deeply can short-change protein and nutrients. Therapeutic weight-loss diets keep nutrients up and dogs fuller on fewer calories, around 300 kcal per cup or less.
Walk, sniff, swim
Start with two 15–20 minute walks a day and build up gradually. Swimming is gentle on sore joints. Exercise helps, but diet does most of the work.
Feed with your hands, not a scoop
Weigh portions on a kitchen scale, use puzzle feeders, and replace food rewards with play, praise and attention.
A pharmacist’s notes for dog weight loss
- Rule out medical causes first. Hypothyroidism and Cushing’s disease cause weight gain, and steroids such as prednisone and anticonvulsants such as phenobarbital increase appetite. A vet check before dieting avoids treating the wrong problem.
- Re-weigh before every refill. Flea, tick and worming products and many prescription drugs are dosed by weight band. As your dog slims down it may move to a smaller band.
- Count the “medicine treats”. Pill pockets, cheese and peanut butter used to give tablets add up over a day. Include them in the treat budget, or ask your pharmacist about flavoured or compounded forms.
- No diet pills. Human weight-loss products and fat burners often contain caffeine or other stimulants that are dangerous to dogs. See the dog caffeine toxicity calculator.
- Joint supplements and fish oil are dosed per kg, often on ideal weight for overweight dogs. Ask your vet which weight to use as your dog slims down.
After the goal: how to keep the weight off
- Raise calories by about 10%, not back to the old amount. Research shows maintenance after weight loss stays low.
- Stay on the weight-management food if possible. Dogs that did so regained less in follow-up studies.
- Weigh monthly and act on a gain of 5% or more by trimming portions by 10% straight away.
- Recalculate maintenance with the dog calorie calculator using the new weight and activity level.
Related dog weight tools
Dog weight loss calculator FAQs
Start with about 1.0 × the resting energy requirement of the ideal weight: 70 × (ideal weight in kg)^0.75. For a dog whose ideal weight is 50 lb (22.7 kg), that’s about 730 kcal a day, adjusted every two weeks based on weigh-ins.
About 1–2% of body weight per week. That’s roughly 0.5–1 lb a week for a 50 lb dog. Faster loss can cost muscle and should only happen under veterinary supervision.
A dog that’s 20% overweight typically needs 10–19 weeks at 1–2% a week. Dogs that are 30–40% over often need 3–8 months. Real-world loss often averages under 1% a week, so expect some slower weeks.
The most common reasons are uncounted treats and table scraps, measuring with a scoop instead of a scale, other people feeding the dog, and calories set too high. Medical causes such as hypothyroidism are also possible. Cut calories by 10% and ask your vet if loss stays below 1% a week.
Small reductions are fine, but large cuts to a regular maintenance food can short-change protein, vitamins and minerals. For significant weight loss, a therapeutic weight-loss diet is safer and keeps dogs fuller.
At least every two weeks, at the same time of day and on the same scale. Weekly weigh-ins are fine, but week-to-week changes are small and noisy.
Start with two 15–20 minute walks a day and increase gradually as fitness improves. Swimming and lead walking are joint-friendly. Exercise supports weight loss and muscle, but calorie control does most of the work.
Baby carrots (about 4 kcal each), plain green beans, cucumber slices, apple slices without seeds and a few blueberries are good choices. You can also use kibble from the daily ration. Keep treats to 10% of daily calories.
Increase calories by only about 10% and keep weighing monthly. Research shows maintenance needs stay low after weight loss, and dogs that stay on a weight-management food regain less.
Yes, and it often eases arthritis pain, but seniors lose muscle easily. Use the gentle 1% pace, a higher-protein weight-loss diet, and vet monitoring.
Not without a vet. Growing puppies need enough energy and nutrients for development. Adjust portions using a puppy growth chart, and use the puppy weight calculator to track expected growth.
It uses veterinary formulas, but individual metabolism varies widely. Treat the calorie target as a starting point and let your dog’s two-weekly weigh-ins guide adjustments.
Manzoor Ahmad
Pharmacist & health writer · 13+ years of web development and SEO experience
Manzoor is a pharmacist with more than nine years of experience writing evidence-based content on nutrition, weight management and supplements. This calculator follows AAHA’s guidance to base weight-loss calories on ideal weight, Cornell’s 1–2% weekly safe-loss range, and peer-reviewed research from the University of Liverpool on weight-loss rates, maintenance energy and regain in dogs. It’s an educational planning tool, not a substitute for your veterinarian.
Sources
- Cornell University College of Veterinary Medicine, Riney Canine Health Center: Obesity and weight loss in dogs.
- 2021 AAHA Nutrition and Weight Management Guidelines: weight reduction in the obese pet.
- German AJ et al. (2007). Dietary energy restriction and successful weight loss in obese client-owned dogs. J Vet Intern Med 21:1174–80.
- German AJ et al. (2011). Low maintenance energy requirements of obese dogs after weight loss. Br J Nutr 106:S93–6.
- German AJ et al. (2012). Long-term follow-up after weight management in obese dogs: the role of diet in preventing regain. Vet J 192:65–70.
Disclaimer: This dog weight loss calculator provides educational estimates based on published veterinary guidance. Individual dogs vary, and weight gain can have medical causes. Talk to your veterinarian before starting a weight-loss plan, particularly for puppies, seniors, pregnant or nursing dogs, and dogs with health conditions or on medication.